How a positive attitude really can make a difference

3. Have a Good Laugh

Laughter prompts physical changes that help the immune and endocrine systems function better.

There's even more. Scientists know that stress has a negative effect on the heart and causes blood vessels to narrow.

The Health Benefits of Laughter

In addition to helping prevent heart disease, a good laugh increases the number and activity of disease-fighting cells, dulls pain, reduces levels of stress-related hormones and prompts the release of feel-good chemicals called endorphins.

"New information coming out of our lab and others shows that a positive emotion like laughter has the opposite effect, releasing chemicals that allow blood vessels to open," explains cardiologist Michael Miller, M.D., of the University of Maryland Medical Center. "We believe that it's good for your heart to laugh regularly," says Miller, "and now we have direct evidence to support that."

Miller's prescription for laughter is at least one good belly laugh a day. So take yourself a little less seriously, find something that tickles your funny bone, and share this wonderful, free gift of laughter with others.